Abbaham halikmaw



'Jan. 24, 1928. 1,657,390

A. HALIKMAN SOUND ELIMINATOR FOR RADIOTUBES Filed Feb. 26. 1927 INVENTORI WITNESSES fllrahaznlialikmau BY I ATTORNEY Patented Jan. 24, 1928.

UNITED STATES ABRAHAM HALIKMAN, NEW YORK, N. Y.

SOUND ELIMINATQR FOIL RADIO'IUBES.

Application filed February 26, 1927. Serial No. 171,271.

This invention relates to sound eliminating devices for radio tubes andhas for an object to provide an improved construction which may bequickly applied and quickly removed and when appliedv may be easilyadjusted.

Another object of the invention is to pro vide a sound eliminator forradio tubes wherein a circular member or ring is brought in contact withthe tube and held in close contact to take up any vibration.

A further object, more specifically J, is to provide a sound eliminatorwherein a rubber ring solid or hollow, is clamped at suitable intervalsto the large part of the radio tube to thereby dampen or completelyeliminate any sound produced by friction, vibration or the like.

In the accompanying drawing Figure 1 is a side view of a conventionalradio tube with an eliminator embodying the invention applied thereto.

Figure 2 is a sectional view through Fig ure 3 on line 22, part of theradio tube being shown in connection therewith.

Figure 3 is an enlarged top plan view. of the eliminator shown in Figure1, part of the casing or body of the eliminator being broken away.

Figure 4 is a top plan view on a reduced scale, of a modified form ofeliminator to that shown in Figure 3.

Referring to the accompanying drawing by numerals, 1 indicates a radiotube which is provided with the usual base 2 and bulb 3. The tube 1,including the interior structure, forms no part of the present inventionbut only the eliminator 45 hereinafter fully do scribed. In all forms ofradio tubes, it has been found that noises occur which are commonlytermed howling. This howling is produced by different causes includingvibration produced mechanically or electrically where vibration is notdesired. To reduce or eliminate what is known as howling in tubes, theeliminator is arranged on the tube as shown in Figures 1 and 2. Thiseliminator is provided with a body or casing 5 preferably of metal andpreferably semi-tubular so that the rubber band 6 may be arranged almostwholly Within the body. The band 6 has been shown as a hollow rubbertube but it may be solid if desired. The band 6 is preferably made sothat the interior diameter is substantially the same as the outsidediameter of the largest part of the bulb 3.

the screws b, which in turn operate the pie our feet 9 \vhercbv the bandor tube {3 is; ores-rd against the tube 1. The feet 2) are looselymounted. on the screw members 8 and, consequently, the feet 9 may adjustthemsilvcs to the action of the band 6 as the screws 8 are tightened. Asshown in Figure 2, the screw members 8 have been tightened until thetube (3 has become slightly flattened on the inner part whereby itlirmly contacts with a section of the radio tube. In the drawing, fourof the screw members 8 and accompanyi presser feet 9 have been disclosedbut it will be evident that a greater number or even a less number mightbe used without departing from the spirit of the invention. It will benoted that the metallic body 5 is not in contact with the tube 1 butonly the rubber band or ring 6. It has been found by experience thatthis band or ring when clamped tightly to the radio tube 1 will reduceand usually eliminate all noise or howling. Preferably the band or ring6 is clamped at the large part of the bulb 3 but it could be clamped atsome other point without departing from the spirit of the invention.

In Figure 4, a slightly modified construction is shown wherein the body5 is open at one point and bent for forming radiating ears 10 and 11. Aclamping screw 12 connects these ears whereby the diameter of the ring 6may be varied so as to accommodate a larger or smaller radio tube. Ifdesired, the screw or bolt 12 may be used for securing the desiredpressure of the ring 6 against the radio tube but preferably the partsare merely adjusted to cause the ring 6' to snugly engage the radio tubeand then the various screw members 8 are operated for causing thedesired pressure against the radio tube.

What I claim is:

1. A sound eliminator for radio tubes comprising a rubber member, asupporting body, and a plurality of screw members coacting with the bodyfor clamping the rubher member against the glass pait of the tube, saidscrew members being manually operated for varying the clamping action.

2. A sound eliminator for radio tubes comprising an encircling rubbermember adapted to encircle and engage the glass part of a radio tube, abody spaced from i ring at different po-iu and out of contact With saidrubber member, and clamping means carried by the body for pressing therubber member against glass part of said tube.

3. A sound. eliminator for a radio tube comprising a resilient ringadapted to en circle a radio tube, a supporting body for surroundingsaid tube and. spaced from said ring, and clamping nieii'ib'ers carriedby the said supportingbody for pressing seetions of said ring againstthe glass part said tube. i at. A sound eliminator for a adio tubecomprising a rubber ring, a suppi'irting body spaced it'roiii andsurrounding said tube, and radially extending screws carried by the bodyacting on said rirg for pressing the against the glass part offsaidtube.

A sound eliminator for radio tubes comprising a rubber ring, anencircling sup: porting body, and a plurality of screw clamping memberscarried by the body and acting on said ring for pressing the ring atdifferent points against the ,usspart of said tube.

(3.1! sound eli ninator for radio tubes comprising arubber ring adaptedto encir cle the glass part of the tube, an annular body se1ni-tubularin cross section pest tioned to partly encircle said ring but reman outof. contact with said tube, a plurality of screw ineniber's carried bysaid b0'cly,'an(1 a clamping foot carried by each screw member, andscrew members acting to force said clan'ip'ing feet against the rubberring and iii turn force the rubber ring tightly against the glass partof said-tube. T. 'A sound"eliminator for radio tubes comprising a rubberring an annular body surr unding said ring; said body being open at onepoint,meansfol/adjusting the size oi? said opening whereby the body willbe increased or decreased in diameter-so as to abcou'unodate differentsize radio tubesfanil clau'iping members carried by said body actingonsaid ring for forcing the same against theglass part oil the radio tube.

SQ A. sound eliininator for u radjo tiubc, con'iprising ahollow ring, anencircling supporting body spaced froin sa id ring, and

screw clamping members carried by said supijmrtiiiig; body ucting on.the ring for pressing the same against the glassjpg irt of,

a tube when the device in use, said ring iartly collapsing when appliedat the points pressed and thereby spreading somewhat.

over the tube to which the device is applied.

ABRAHAM HA KMA

